JPH073687Y2 - Satellite broadcasting antenna - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to a satellite broadcasting receiving antenna, and relates to a reflector in an offset type parabolic antenna which is set outdoors for home use and the like. It is intended to prevent collapse under a condition with a simple structure.

(Industrial application field) Antenna for satellite broadcasting reception.

(Prior Art) Generally, antennas installed in homes as antennas for receiving satellite broadcasts are often offset type parabolic antennas, and the radio waves from the broadcasting satellites are reflected by the reflector plate of the antennas to become primary radiators. The reflection plate is configured to collect the radio waves, and the reflection plate is a primary radiator having a curved surface for focusing, and is often installed outdoors at a high place. The size of the reflector is 45 cm in diameter
It has the above elliptical shape.

In the one disclosed in JP-A-61-128612, the reflector of the parabolic antenna is divided into four or more parts by dividing lines along the radial direction, and one side of each of the divided reflectors is used as a spindle. A connecting shaft pivotally supported on the frame and having a free end having a superposed step on the other side is provided with a connecting shaft in which a spring is interposed between the free end and a pivotally connecting part of an adjacent divided reflector and a nut is screwed. It is described that it is provided and a strong wind causes a gap to escape the wind pressure.

(Problems to be Solved by the Invention) Since the reflector in the satellite broadcasting receiving antenna as described above has a considerable area, there is a high possibility that the reflector will be collapsed or damaged by wind pressure or the like under strong wind conditions.

That is, it is clear that the reflector plate receives a large wind pressure from both the front and back sides when the wind is strong, and it is also generally known that a negative pressure phenomenon occurs on the back side. Therefore, they are likely to undergo a combined action and collapse or damage.

Therefore, when setting it, it is necessary to fix it in consideration of complicated phenomena such as the above-mentioned wind pressure during strong winds, and it is necessary to devise a large amount of strength and structure of the mounting bracket, and the mounting man-hour is also required. Large and of course the installation costs are high.

The above-mentioned Japanese Patent Laid-Open No. 61-128612 requires the central body, the frame and the four division reflectors even if the wind pressure due to the strong wind can be released, and its construction is very complicated. However, there is a drawback in that a large number of members and man-hours are required, and a supporting shaft to which a plurality of nuts and springs are attached projects to the back surface of the parabolic antenna, which is not preferable in appearance and appearance.

"Configuration of device" (Means for solving the problem) In a parabolic antenna that receives radio waves from a broadcasting satellite, an opening is formed in a central portion of a reflecting plate that reflects the radio waves and focuses them on a primary radiator. The upper part of the movable part is provided in the opening so as to be openable and closable by pivoting means, and the movable part can be maintained in the closed position by mutual suction between both sides of the lower part of the movable part and the rim of the opening. An antenna for receiving satellite broadcasts, characterized in that a magnetic material is provided for each of them.

(Operation) The opening formed in the central portion of the reflector is normally formed by a movable body which is openably and closably attached to the upper portion of the opening by a pivoting means and a magnetic body which is installed at the rim of the opening. Maintained in closed position.

In strong winds, the wind pressure exceeds the attractive force between the magnetic bodies in both the front and back directions, and the lower part of the movable part is opened and air is vented from the opening, reducing the wind pressure on the reflector and reflecting it. The negative pressure state on the downstream side of the plate in the wind direction is reduced.

By reducing the wind pressure on the wind improving side and the negative pressure state on the downstream side of the reflector as described above, the acting force on the reflector supporting mechanism during strong wind is reduced, and the design and construction conditions of the supporting mechanism are simplified. To do.

Since the movable part is pivotally attached to the upper edge of the opening in the upper part, the movable part that is opened during the strong wind action as described above forms a drooping state by its own weight when the strong wind is stopped. In this state, the magnetic bodies on both sides of the lower part are close to the magnetic bodies on the rim of the opening, and since the magnetic bodies are provided opposite to each other on the both sides, the magnetic bodies are effectively attracted to automatically form the closed state.

(Embodiment) A concrete embodiment of the present invention as described above will be described with reference to the accompanying drawings. FIG. 1 shows a general structural relationship of the present invention.
A converter 3 integrally formed with a secondary radiator 2 is attached by a support rod 4, and an offset parabolic antenna supported by the support rod 4 is attached to a pole 5. The reflector 1 is an annular fixing portion 11 and its central opening. Movable part provided in part 13
The movable part 12 is attached to the upper part of the rim of the opening 13 by means of pivoting means 6 as shown in FIG. Also, as described above, the central opening 13
Magnetic bodies 7a and 7b such as ferrite magnets having polarities that mutually attract each other are provided on both lower sides of the portion and both lower side portions of the movable portion 12. That is, in the illustrated example, the pivoting means 6 is provided in the vicinity of the apex of the opening 13 and the movable portion body 12, and two sets of magnetic bodies 7a and 7b are adopted so that the opening portion 13 and the lower portion of the movable portion body 12 are opposed to each other. The movable part 12 is provided so as to hang down below the pivot means by gravity.

As shown in FIG. 3, the magnetic members 7a and 7b are movable parts 12a and 12b.
The movable part body 12 provided with a slight gap between the peripheral edge of the movable part body 12 and the rim of the opening part 13 so that the maximum suction action can be obtained when the opening part 13 is closed. The magnetic body 7a, 7b
Acts to automatically form a closed state. As shown in the figure, the fixed body 11 and the movable body 12 form a series of curved surfaces to reflect radio waves and focus them on the primary radiator.

That is, in the normal state, it is clear that the magnetic bodies 7a and 7b are attracted and the movable portion body 12 maintains the state in which the opening portion 13 of the fixed portion body 11 is closed, thereby accurately receiving satellite broadcasting. A strong wind pressure acts on the reflection plate 1 as described above, and the wind pressure exceeds the suction force of the magnetic bodies 7a and 7b, so that the movable body 12 is opened as shown in FIG. The acting wind pressure is greatly reduced. In the case of FIG. 4, the wind pressure is applied from the front surface. However, even when the wind pressure acts from the back surface of the reflection plate 1, the movable portion 12 is moved to the front surface as shown in FIG. Similarly, the opening 13 is opened to reduce the wind pressure. When the wind pressure is released, the movable part 12 closes the opening 13, that is, the movable part 12 opened by the wind pressure that overcomes the maximum suction force of the magnetic bodies 7a and 7b does not open under the condition that the wind pressure continues. The air condition is continued, but the wind pressure is reduced and the movable part 12 is hung by gravity, so that the attraction force between the magnetic bodies 7a and 7b acts and the closed state as shown in FIGS. Be restored to.

With respect to the shapes of the magnetic bodies 7a and 7b, it is desirable to form curved sides along the rim of the opening 13 so as to be as close as possible along the rim.

The reflection plate 1 is attached to the pole 5 described above so that the movable pieces 12 can be prevented from being opened or closed by mounting pieces (not shown) such as support pieces 8 and 9 as shown in FIGS. However, as mentioned above, a relatively simple structure is sufficient because the advanced design and construction conditions that prevent the reflector 1 from being collapsed even under strong wind pressure are reduced. Becomes

[Advantages of the Invention] According to the present invention as described above, the reflecting plate is provided with an opening, and the upper part of the movable body is attached by the pivoting means to attract the magnetic body provided in the movable part and the opening. To form a stable satellite broadcasting reception state by forming an integrated closed state of the opening, and also to open the movable part even under wind pressure from either the front or the rear in strong wind. The wind pressure on the reflector plate can be greatly reduced to prevent collapse and damage appropriately.In addition, during the rest of the wind after that, the drooping action of the moving part due to gravity and the magnetic attraction force are used for automatic restoration. Therefore, the structure is extremely simple and has the effect of economically preventing collapse due to wind force, which is a great idea in practice.

[Brief description of drawings]

The drawings show the technical contents of the present invention, and FIG. 1 is a perspective view showing the general structural relationship of the present invention, and FIG.
FIG. 3 is a back view of the reflector, FIG. 3 is a longitudinal sectional view of the reflector, and FIGS. 4 and 5 are sectional views of the movable portion body opened by the strong wind pressure. In these drawings, 1 is a reflector, 2 is a primary radiator, 3 is a converter, 4 is a support rod, 5 is a pole, 6 is a pivoting means, 7a and 7b are magnetic bodies, and 8 and 9 are support pieces. , 11 is a fixed part, 12 is a movable part, and 13 is an opening.

Claims (1)

[Scope of utility model registration request] 1. In a parabolic antenna for receiving radio waves from a broadcasting satellite, an opening is formed in the central portion of a reflector plate that reflects the radio waves and focuses them on a primary radiator, and an upper portion of a movable part is formed in the opening. Is provided so as to be openable and closable by a pivoting means, and a magnetic body for mutually attracting both sides of the lower part of the movable part and the rim of the opening to maintain the movable part in the closed position is provided. An antenna for receiving satellite broadcasting, which is characterized by being provided.